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A converse theorem and the Saito-Kurokawa lift. (English) Zbl 0849.11039
In the paper under review the authors give a new proof of the Saito-Kurokawa lifting. More precisely they construct the lifting from Kohnen’s $$+$$-space to the Maaß Spezialschar avoiding Jacobi forms. The new approach is to use K. Imai’s converse theorem [Am. J. Math. 102, 903-936 (1980; Zbl 0447.10028)], i.e. a generalization of Hecke’s correspondence between Siegel cusp forms of degree 2 and Koecher-Maaß series with functional equations. This non-trivial reduction requires the identification of a sum over Heegner points of a Maaß form of weight 0 as Fourier coefficients of a form of weight 1/2.
Reviewer: A.Krieg (Aachen)

##### MSC:
 11F46 Siegel modular groups; Siegel and Hilbert-Siegel modular and automorphic forms 11F37 Forms of half-integer weight; nonholomorphic modular forms
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